MVP3: added dotted lines to show who connected to who

src/app/api/graph/route.ts

@@ -9,6 +9,7 @@ export async function GET() {
       prisma.person.findMany(),
       prisma.connection.findMany(),
     ]);
+
     const nameById = new Map(people.map((p: any) => [p.id, p.name]));
 
     const nodes = people.map((p: any) => ({
@@ -19,21 +20,59 @@ export async function GET() {
       role: p.role,
     }));
 
-    const edges = connections.map((c: any) => {
-      const introducedByNames: string[] = Array.isArray(c.introducedByChain)
-        ? c.introducedByChain.map((pid: string) => nameById.get(pid)).filter(Boolean)
-        : [];
-      return {
+    const edges: any[] = [];
+
+    for (const c of connections as any[]) {
+      const chain: string[] = Array.isArray(c.introducedByChain) ? c.introducedByChain : [];
+      const introducedByNames: string[] = chain.map((pid: string) => nameById.get(pid)).filter(Boolean) as string[];
+      const hasProv = chain.length > 0;
+
+      if (!hasProv) {
+        // Plain direct edge (no introducer)
+        edges.push({
+          id: c.id,
+          source: c.personAId,
+          target: c.personBId,
+          introducedByCount: 0,
+          hasProvenance: false,
+          introducedByNames: [],
+          eventLabels: Array.isArray(c.eventLabels) ? c.eventLabels : [],
+          notes: c.notes ?? null,
+        });
+        continue;
+      }
+
+      // 1) Original A—C edge rendered as dotted "indirect" line
+      edges.push({
         id: c.id,
         source: c.personAId,
         target: c.personBId,
-        introducedByCount: c.introducedByChain.length,
-        hasProvenance: c.introducedByChain.length > 0,
+        introducedByCount: chain.length,
+        hasProvenance: true,
         introducedByNames,
         eventLabels: Array.isArray(c.eventLabels) ? c.eventLabels : [],
         notes: c.notes ?? null,
-      };
-    });
+        indirect: true,
+      });
+
+      // 2) Virtual path edges along introducer chain: A—B, B—…—C (solid)
+      const path = [c.personAId, ...chain, c.personBId];
+      for (let i = 0; i < path.length - 1; i++) {
+        const source = path[i];
+        const target = path[i + 1];
+        edges.push({
+          id: `virtual:${c.id}:${i}:${source}:${target}`,
+          source,
+          target,
+          introducedByCount: chain.length,
+          hasProvenance: true,
+          introducedByNames,
+          eventLabels: Array.isArray(c.eventLabels) ? c.eventLabels : [],
+          notes: c.notes ?? null,
+          virtual: true,
+        });
+      }
+    }
 
     return NextResponse.json({ nodes, edges }, { status: 200 });
   } catch (err) {

src/components/Graph.tsx

@@ -54,6 +54,10 @@ export default function Graph({ data, height = 600 }: Props) {
         e.introducedByNames && e.introducedByNames.length
           ? `Introduced by: ${e.introducedByNames.join(" → ")}`
           : "";
+      // Only set flags when true so the style selector [indirect] matches by presence.
+      const flags: Record<string, any> = {};
+      if ((e as any).indirect) flags.indirect = "1";
+      if ((e as any).virtual) flags.virtual = "1";
       return {
         data: {
           id: e.id,
@@ -65,6 +69,7 @@ export default function Graph({ data, height = 600 }: Props) {
           eventLabels: e.eventLabels ?? [],
           notes: e.notes ?? null,
           edgeLabel: label,
+          ...flags,
         },
       };
     });
@@ -117,6 +122,24 @@ export default function Graph({ data, height = 600 }: Props) {
             "line-color": "#16a34a", // green-600
           },
         },
+        // Dotted line for indirect A—C edge when there is an introducer
+        {
+          selector: "edge[indirect], edge[introducedByCount > 0][!virtual]",
+          style: {
+            // Make indirect A—C edge or any non-virtual edge with provenance visibly different
+            "line-style": "dashed",
+            "line-color": "#64748b", // slate-500 for contrast
+            width: 2,
+            opacity: 0.9,
+          },
+        },
+        // Keep virtual path edges solid (default)
+        {
+          selector: "edge[virtual]",
+          style: {
+            "line-style": "solid",
+          },
+        },
         {
           selector: "edge:selected",
           style: {

src/lib/validators.ts

@@ -47,7 +47,7 @@ export const graphNodeSchema = z.object({
 });
 
 export const graphEdgeSchema = z.object({
-  id: z.string().uuid(),
+  id: z.string(),
   source: z.string().uuid(),
   target: z.string().uuid(),
   introducedByCount: z.number().int().nonnegative(),
@@ -55,6 +55,9 @@ export const graphEdgeSchema = z.object({
   introducedByNames: z.array(z.string()).default([]).optional(),
   eventLabels: z.array(z.string()).default([]).optional(),
   notes: z.string().nullable().optional(),
+  // Visualization flags
+  indirect: z.boolean().optional(), // true for the original A—C edge when an introducer exists (dotted)
+  virtual: z.boolean().optional(),  // true for virtual path edges (A—B, B—C, ...)
 });
 
 export const graphResponseSchema = z.object({